LG Multi V ARUB Series Installation Manual page 37

N The Amount of Refrigerant
The calculation of the additional charge should take account of the length of pipe.
Product charge(1unit)=8kg
A
B
Additional charge (kg)
=
Total liquid pipe (m): Ø22.2mm
+
Total liquid pipe (m): Ø19.05mm
+
Total liquid pipe (m): Ø15.88mm
+
Total liquid pipe (m): Ø12.7mm
+
Total liquid pipe (m): Ø9.52mm
+
Total liquid pipe (m): Ø6.35mm
+
Number of installed HR units
+
CF(kg) (Correction factor)
Total amount(kg)
CAUTION If a negative result is obtained from
the calculation, no refrigerant needs
to be added.
WARNING
Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which indoor unit of the least capacity is installed
❐ If the above equation can not be satisfied, then follow the following steps.
- Selection of air conditioning system: select one of the next
1. Installation of effective opening part
2. Reconfirmation of outdoor unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)
- Change indoor unit type
: installation position should be over 2m from the floor (wall mounted type ¡ cassette type)
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: Prepare for earthquake and thermal stress
WARNING
x 0.354(kg/m)
x 0.266(kg/m)
x 0.173(kg/m)
x 0.118(kg/m)
x 0.061(kg/m)
x 0.022(kg/m)
x 0.5 kg(4 Rooms)
= +
A B
Refer to model information since the CF value of correction factor differs depending
on model.
Refrigerant piping installation
Ex) ARUB1208T1
Outdoor unit
HR unit (1EA)
Indoor unit
A: Ø12.7, 50m
B: Ø9.52, 10m
C: Ø9.52, 10m
D: Ø9.52, 10m
E: Ø6.35, 10m
Additional Charge = A X 0.118 + B X 0.061 + C X 0.061
+ D X 0.061 + E X 0.022 + HR + CF
= 50 X 0.118 + 10 X 0.061 + 10 X 0.061
+ 10 X 0.061 + 10 X 0.022 + 0.5(HR) + 1(CF)
= 7.45(kg)
0.3 ( kg / m
Installation Manual 37
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